Digital Raster Graphic - Metadata --Identification Information-- -Citation- 8.1 ORIGINATOR: USGS 8.2 PUBLICATION DATE: 19980226 8.4 TITLE: Tutuila Island 8.6 GEOSPATIAL DATA PRESENTATION FORM: "map" -Publication Information- 8.8.1 PUBLICATION PLACE: Reston, VA 8.8.2 PUBLISHER: USGS -Description- 1.2.1 ABSTRACT: The Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic map including the collar information, georeferenced to the UTM grid. 1.2.2 PURPOSE: A DRG is useful as a source or background layer in a GIS, as a means to perform quality assurance on other digital products, and as a source for the collection and revision of DLG data. DRG's can also be merged with other digital data, e.g. DEM's or DOQ's, to produce a hybrid digital file. 1.2.3 SUPPLEMENTAL INFORMATION: 515555.305095, 8429013.930934 -Time period of content- Single Date/Time 9.1.1 CALENDAR DATE: 19980226 1.3.1 CURRENTNESS REFERENCE: "Ground Condition" -Status- 1.4.1 PROGRESS: "Complete" 1.4.2 MAINTENANCE AND UPDATE FREQUENCY: "Irregular" -Spatial Domain- Bounding Coordinates 1.5.1.1 WEST BOUNDING COORDINATE: -170.850000 1.5.1.2 EAST BOUNDING COORDINATE: -170.533300 1.5.1.3 NORTH BOUNDING COORDINATE: -14.216700 1.5.1.4 SOUTH BOUNDING COORDINATE: -14.383300 -Keywords- Theme 1.6.1.1 THEME KEYWORD THESAURUS: "None" 1.6.1.2 THEME KEYWORD: digital raster graphic 1.6.1.2 THEME KEYWORD: DRG 1.6.1.2 THEME KEYWORD: topographic map Place 1.6.2.1 PLACE KEYWORD THESAURUS: Department of Commerce, 1977, Countries, Dependencies, Areas of Special Sovereignty, and their Principal Administrative Divisions (Federal Information Processing Standard 10-3): Washington, Department of Commerce, National Institute of Standards and Technology. 1.6.2.2 PLACE KEYWORD: US 1.6.2.1 PLACE KEYWORD THESAURUS: Department of Commerce, 1987, Codes for the Identification of the States, The District of Columbia and the Outlying Areas Of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, Department of Commerce, National Institute of Standards and Technology. 1.6.2.2 PLACE KEYWORD: AS 1.6.2.2 PLACE KEYWORD: 1.6.2.2 PLACE KEYWORD: 1.6.2.2 PLACE KEYWORD: 1.7 ACCESS CONSTRAINTS: "None" 1.8 USE CONSTRAINTS: Acknowledgment of the USGS would be appreciated in products derived from these data. 1.11 DATA SET CREDIT: This DRG was produced through an Innovative Partnership agreement between The Land Information Technology Company, Ltd., of Aurora, CO and the USGS. --Data Quality Information-- -Attribute Accuracy- 2.1 ATTRIBUTE ACCURACY REPORT: The DRG is an 8-bit color image that employs a color palette to ensure uniform colors throughout a particular DRG series. All DRG's within a series must have the same RGB value. 2.2 LOGICAL CONSISTENCY REPORT: Not Applicable 2.3 COMPLETENESS REPORT: The DRG is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the DRG due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible. Data completeness for DRG files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints. For information on collection and inclusion criteria, see U.S. Geological Survey, 1994, Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps: National Mapping Program Technical Instructions and U.S. Geological Survey, 1994, Standards for Digital Line Graphs: National Mapping Program Technical Instructions. -Positional Accuracy- Horizontal Positional Accuracy 2.4.1.1 HORIZONTAL POSITIONAL ACCURACY REPORT: While the datum of the published map is retained, in order to be consistent with other USGS digital data, this image is cast on the UTM and may therefore be INCONSISTENT with the credit note on the image collar. Because the Clark 1866 Ellipsoid was used in georeferencing, UTM coordinates from the DRG may not reflect those values found on the map collar. For example; maps of islands in the Pacific Ocean have UTM coordinates referenced to the International 1924 Ellipsoid. This fact may not be evident from the information provided in the credit note. Vertical Positional Accuracy 2.4.2.2 VERTICAL POSITIONAL ACCURACY REPORT: Refer to the DRG collar for information about vertical positional accuracy. -Lineage- Source Information Source Citation 2.5.1.5 SOURCE CITATION ABBREVIATION: map1 8.1 ORIGINATOR: USGS 8.2 PUBLICATION DATE: 8.4 TITLE: Tutuila Island 8.6 GEOSPATIAL DATA PRESENTATION FORM: "map" --Publication Information-- 8.8.1 PUBLICATION PLACE: Reston, VA 8.8.2 PUBLISHER: USGS 2.5.1.2 SOURCE SCALE DENOMINATOR: 2.5.1.3 TYPE OF SOURCE MEDIA: "paper" -Source Time Period of Content- Single Date/Time 9.1.1 CALENDAR_DATE: 2.5.1.4.1 SOURCE CURRENTNESS REFERENCE: "ground condition" 2.5.1.6 SOURCE CONTRIBUTION: The source map is scanned to produce the DRG. -Process Step- 2.5.2.1 PROCESS DESCRIPTION: The production procedures, instrumentation, hardware, and software used in the collection of standard DRG products vary depending on systems used at the contract, cooperator or USGS production sites. The majority of DRG data sets are acquired through government contract. The process step describes, in general, the process used in the production of standard DRG data sets. 1. Production of a DRG begins with the scanning of a paper 7.5-minute topographic map (map1) on a high-resolution scanner. Scanning resolutions range from 500 - 1000 dpi with the output file running between 160-300 mb. 2. Removal of screens (descreening) and color quantization to reduce the number of colors also takes place during the scanning phase. 3. The raw scan file is then transformed and georeferenced using UTM coordinates of the sixteen 2.5-minute grid ticks, which are obtained using the in-house produced program COORDAT and stored in a ground control file. Those sixteen 2.5-minute ticks are interactively visited and assigned their respective UTM coordinates. USGS program XSHAPES4 then performs a piecewise linear rubber sheet transformation. 4. An output resolution of 2.4 meters (8.2 feet) is chosen in order to resample the file to 250 dpi. 5. The image file is converted to a TIFF and further reduced by converting the file to a run length encoding Packbits compression(type 32773). 6. The color palette of the compressed DRG is then standardized by replacing the original RGB values assigned during the scanning process with standard RGB value combinations using the in-house produced TIFFREMAP program. 7. Prior to archiving the DRG undergoes the following quality assurance procedures: a. The color index values of each DRG are checked to ensure the RGB combinations are consistent with the standardized color palette. b. All DRG files are inspected to ensure that they are geometrically consistent with normal map presentation. c. Selected DRG's are checked to ensure that data elements in the DRG metadata file correspond to the map collar information and to the information in the associated image file. d. Selected DRG's are checked for georeferencing accuracy by comparing the book value of latitude and longitude tick marks with corresponding tick intersections in the DRG image. e. Transformations are checked on selected DRG's by comparing the positions of well defined points, such as UTM grid intersections in the graphic product, with the corresponding image points in the DRG. USGS DRG production specifications are available on request from the National Mapping Division and Mid-Continent Mapping Center by contacting: Rolla-ESIC U.S. Geological Survey 1400 Independence Rd., MS231 Rolla, MO 65401-2602 Phone (573)308-3500 Facsimile (573)308-3615 E-mail to mcmcesic@usgs.gov World Wide Web: http://mcmcweb.er.usgs.gov/drg/ 2.5.2.2 SOURCE USED CITATION ABBREVIATION: map1 2.5.2.3 PROCESS DATE: 19980226 --Spatial Data Organization Information-- 3.2 DIRECT SPATIAL REFERENCE METHOD: "Raster" -Raster Object Information- 3.4.1 RASTER OBJECT TYPE: "Pixel" 3.4.2 ROW COUNT: 8076 3.4.3 COLUMN COUNT: 14517 --Spatial Reference Information-- -Horizontal Coordinate System Definition- Planar 4.1.2.2.1 GRID COORDINATE SYSTEM NAME: "Universal Transverse Mercator" Universal Transverse Mercator (UTM) 4.1.2.2.2.1 UTM ZONE NUMBER: 2 Transverse Mercator 4.1.2.1.2.17 SCALE FACTOR AT CENTRAL MERIDIAN: 0.9996 4.1.2.1.2.2 LONGITUDE AT CENTRAL MERIDIAN: -171.000 4.1.2.1.2.3 LATITUDE OF PROJECTION ORIGIN: 0.0 4.1.2.1.2.4 FALSE EASTING: 500000. 4.1.2.1.2.5 FALSE NORTHING: 0.0 --Planar Coordinate Information-- 4.1.2.4.1 PLANAR COORDINATE ENCODING METHOD: "row and column" -Coordinate Representation- 4.1.2.4.2.1 ABSCISSA RESOLUTION: 2.438400 4.1.2.4.2.2 ORDINATE RESOLUTION: -2.438400 4.1.2.4.4 PLANAR DISTANCE UNITS: "meters" -Geodetic Model- 4.1.4.1 HORIZONTAL DATUM NAME: 4.1.4.2 ELLIPSOID NAME: 4.1.4.3 SEMI-MAJOR AXIS: 4.1.4.4 DENOMINATOR OF FLATTENING RATIO: --Entity and Attribute Information-- -Overview Description- 5.2.1 Each raster entity or pixel contains a color index from 0 through 12 referencing a color palette of RGB values from 0 through 255 in which the standard colors used in the DRG are defined. USGS DRG Color Palette Digital Number Color Red Green Blue 0 Black 0 0 0 1 White 255 255 255 2 Blue 0 151 164 3 Red 203 0 23 4 Brown 131 66 37 5 Green 201 234 157 6 Purple 137 51 128 7 Yellow 255 234 0 8 Light Blue 167 226 226 9 Light Red 255 184 184 10 Light Purple 218 179 214 11 Light Grey 209 209 209 12 Light Brown 207 164 142 5.2.2 ENTITY AND ATTRIBUTE DETAIL CITATION: Draft Standards for Digital Raster Graphic. --Distribution Information-- -Distributor- Contact Organization Primary 10.1.2 CONTACT ORGANIZATION: Earth Science Information Center, U.S. Geological Survey Contact Address 10.4.1 ADDRESS TYPE: "mailing address" 10.4.2 ADDRESS: 507 National Center 10.4.3 CITY: Reston 10.4.4 STATE OR PROVINCE: Virginia 10.4.5 POSTAL CODE: 22092 10.5 CONTACT VOICE TELEPHONE: 1 800 USA MAPS 10.5 CONTACT VOICE TELEPHONE: 1 703 648 6045 6.3 DISTRIBUTION LIABILITY: Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. The USGS will warrant the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer input peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustment of credit must be made within 90 days from the date of this shipment from the ordering site. -Standard Order Process- Digital Form Digital Transfer Information 6.4.2.1.1 FORMAT NAME: TIFF 6.4.2.1.2 FORMAT VERSION NUMBER: 6.0 6.4.2.1.6 FILE DECOMPRESSION TECHNIQUE: Packbits Digital Transfer Option Offline Options 6.4.2.2.2.1 OFFLINE MEDIA: "CD-ROM" 6.4.2.2.2.3 RECORDING FORMAT: "ISO 9660"; DRG image files with corresponding metadata files. 6.4.3 FEES: For delivery on CD-ROM, the charge is $32 per CD-ROM --Metadata Reference Information-- 7.1 METADATA DATE: 19980226 Metadata Contact Contact Organization Primary 10.1.2 CONTACT ORGANIZATION: U.S. Geological Survey Contact Address 10.4.1 ADDRESS TYPE: "mailing address" 10.4.2 ADDRESS: 590 National Center 10.4.3 CITY: Reston 10.4.4 STATE OR PROVINCE: Virginia 10.4.5 POSTAL CODE: 22092 10.5 CONTACT VOICE TELEPHONE: 1 703 648 4533 10.8 CONTACT ELECTRONIC MAIL ADDRESS: Copies of this publication are available from anonymous File Transfer Protocol (anonymous FTP); ftp://fgdc.er.usgs.gov/ 7.5 METADATA STANDARD NAME: "Content Standards for Digital Geospatial Metadata" 7.6 METADATA STANDARD VERSION: 19940608